+1! ^

And I'm not familiar with the chromovelo process per sae, but translucent red sounds about right.
If it were transparent red, it's common name would be "candy apple" red.
And you get better adhesion if you powdercoat those types of colors over the chrome, rather than "wet" paint.
Wet paint requires a primer for adhesion, negating the translucent/transparent effects.
It may have been wet painted originally, which mens it will likely chip pretty easily.
If it doesn't chip easily, then it may have been powdercoated.
Or a special translucent paint with an adhesion promoter added.

To touch-up a color like that, your best bet is going to be fingernail polish.

And that Marco reminds me of my first Italian bike, a Bianchi. I wasn't much for Celeste #227, so I stripped that off and found a fully chromed frame. Only the lugs had been polished though, and left exposed.
So I masked off the lugs and rattlecanned some candy red on it. Added some black graphic dry-transfer letters and sprayed more candy red to hold them in place. The candy red doesn't show over the black letters.

I was often complimented on my nice "Vitus"!

(Vitus 979's were a popular anodized/bonded aluminum frame of that era)
and that's what my Bianchi looked like.
(and it still does, as I saw it a few months ago) ...
I Painted it back in what? ... 1981!